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Infer variance of types with respect to the region parameter.

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A similar approach could be used for type parameters.

Fixes #2282.
This commit is contained in:
Niko Matsakis 2012-08-09 09:59:50 -07:00
parent 8185ede1fa
commit 511e7626ae
33 changed files with 720 additions and 232 deletions
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10
src/rustc/middle/astencode.rs
View file

@ -601,8 +601,10 @@ impl ebml::writer: ebml_writer_helpers {
self.emit_bounds(ecx, bs);
}
}
do self.emit_rec_field(~"rp", 1u) {
self.emit_bool(tpbt.rp);
do self.emit_rec_field(~"region_param", 1u) {
ty::serialize_opt_region_variance(
self,
tpbt.region_param);
}
do self.emit_rec_field(~"ty", 2u) {
self.emit_ty(ecx, tpbt.ty);
@ -817,8 +819,8 @@ impl ebml::ebml_deserializer: ebml_deserializer_decoder_helpers {
bounds: self.read_rec_field(~"bounds", 0u, || {
@self.read_to_vec(|| self.read_bounds(xcx) )
}),
rp: self.read_rec_field(~"rp", 1u, || {
self.read_bool()
region_param: self.read_rec_field(~"region_param", 1u, || {
ty::deserialize_opt_region_variance(self)
}),
ty: self.read_rec_field(~"ty", 2u, || {
self.read_ty(xcx)